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DescriptionAndrew Kuhlmann
2016-11-16 19:26:24 UTC
Description of problem:
SSH Daemon sporadically fails to restart due to PID file becoming out of sync with reality.
Initially around 80% of the time the service will come up with the following warning:
$ systemctl status sshd
* sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2016-11-15 23:10:55 UTC; 19h ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 8071 (sshd)
CGroup: /system.slice/sshd.service
`-8071 /usr/sbin/sshd
Nov 15 23:10:55 server.local systemd[1]: Starting OpenSSH server daemon...
Nov 15 23:10:55 server.local systemd[1]: PID file /var/run/sshd.pid not readable (yet?) after start.
Nov 15 23:10:55 server.local systemd[1]: Started OpenSSH server daemon.
Around 20% of the time after a restart especially quickly successive restarts the pidfile will not reflect the actual process that is running.
This results in a state where sshd is running but systemd doesn't know the pid so it is unable to kill it, and since sshd is holding onto port 22 (or whatever) it is unable to bind and the process dies.
Version-Release number of selected component (if applicable):
Latest RHEL7.2 RPM.
How reproducible:
Happens very often during automated actions that require quick restarts of sshd service.
Steps to Reproduce:
1. Restart sshd service rapidly
Actual results:
sshd service in a broken state, but sshd is still running
Expected results:
sshd service should restart cleanly every time unless there is a config problem
Additional info:
This problem started after bug 1291172 was included in 6.6.1p1-26
This is already reported in a bug #1381997 we plan to address this issue soon.
Inability of systemd to track running sshd process makes us to add systemd patch to sshd, which worked just fine for a years this way.
*** This bug has been marked as a duplicate of bug 1381997 ***
Description of problem: SSH Daemon sporadically fails to restart due to PID file becoming out of sync with reality. Initially around 80% of the time the service will come up with the following warning: $ systemctl status sshd * sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: active (running) since Tue 2016-11-15 23:10:55 UTC; 19h ago Docs: man:sshd(8) man:sshd_config(5) Main PID: 8071 (sshd) CGroup: /system.slice/sshd.service `-8071 /usr/sbin/sshd Nov 15 23:10:55 server.local systemd[1]: Starting OpenSSH server daemon... Nov 15 23:10:55 server.local systemd[1]: PID file /var/run/sshd.pid not readable (yet?) after start. Nov 15 23:10:55 server.local systemd[1]: Started OpenSSH server daemon. Around 20% of the time after a restart especially quickly successive restarts the pidfile will not reflect the actual process that is running. This results in a state where sshd is running but systemd doesn't know the pid so it is unable to kill it, and since sshd is holding onto port 22 (or whatever) it is unable to bind and the process dies. Version-Release number of selected component (if applicable): Latest RHEL7.2 RPM. How reproducible: Happens very often during automated actions that require quick restarts of sshd service. Steps to Reproduce: 1. Restart sshd service rapidly Actual results: sshd service in a broken state, but sshd is still running Expected results: sshd service should restart cleanly every time unless there is a config problem Additional info: This problem started after bug 1291172 was included in 6.6.1p1-26